title: Graphene/liquid crystal based terahertz phase shifters.
abstract: Due to its high electrical conductivity and excellent transmittance at terahertz frequencies, graphene is a promising candidate as transparent electrodes for terahertz devices. We demonstrate a liquid crystal based terahertz phase shifter with the graphene films as transparent electrodes. The maximum phase shift is 10.8 degree and the saturation voltage is 5 V with a 50 µm liquid crystal cell. The transmittance at terahertz frequencies and electrical conductivity depending on the number of graphene layer are also investigated. The proposed phase shifter provides a continuous tunability, fully electrical controllability, and low DC voltage operation.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wu
authors.forename: Xuezhong
authors.initials: X
authors.lastname: Ruan
authors.forename: Chih-Hsin
authors.initials: CH
authors.lastname: Chen
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Shin
authors.forename: Youngbin
authors.initials: Y
authors.lastname: Lee
authors.forename: Jing
authors.initials: J
authors.lastname: Niu
authors.forename: Jingbo
authors.initials: J
authors.lastname: Liu
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Chen
authors.forename: Kun-Lin
authors.initials: KL
authors.lastname: Yang
authors.forename: Xinhai
authors.initials: X
authors.lastname: Zhang
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Ahn
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Yang